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Response of soil respiration to changes in soil temperature and water table level in drained and restored peatlands of the southeastern United States
EESwails,MArd\u00f3n,KWKrauss,ALPeralta,REEmanuel,AMHelton,JLMorse,LGutenberg,NCormier,DShoch,SSettlemyer,ESoderholm,BPBoutin,CPeoples,SWard
Carbon Balance and Management Pub Date : 11/19/2022 00:00:00 , DOI:10.1186/s13021-022-00219-5
Abstract
Extensive drainage of peatlands in the southeastern United States coastal plain for the purposes of agriculture and timber harvesting has led to large releases of soil carbon as carbon dioxide (CO2) due to enhanced peat decomposition. Growth in mechanisms that provide financial incentives for reducing emissions from land use and land-use change could increase funding for hydrological restoration that reduces peat CO2 emissions from these ecosystems. Measuring soil respiration and physical drivers across a range of site characteristics and land use histories is valuable for understanding how CO2 emissions from peat decomposition may respond to raising water table levels. We combined measurements of total soil respiration, depth to water table from soil surface, and soil temperature from drained and restored peatlands at three locations in eastern North Carolina and one location in southeastern Virginia to investigate relationships among total soil respiration and physical drivers, and to develop models relating total soil respiration to parameters that can be easily measured and monitored in the field. Total soil respiration increased with deeper water tables and warmer soil temperatures in both drained and hydrologically restored peatlands. Variation in soil respiration was more strongly linked to soil temperature at drained (R2 = 0.57, p  中文翻译: 美国东南部排水和恢复泥炭地土壤呼吸对土壤温度和地下水位变化的响应 为了农业和木材采伐,美国东南部沿海平原的泥炭地大量排水,由于泥炭分解增强,导致土壤中的碳以二氧化碳 (CO2) 的形式大量释放。为减少土地利用和土地利用变化产生的排放提供财政激励的机制的发展可能会增加用于水文恢复的资金,从而减少这些生态系统的泥炭 CO2 排放。在一系列场地特征和土地利用历史中测量土壤呼吸和物理驱动因素对于了解泥炭分解产生的 CO2 排放如何响应地下水位升高很有价值。我们结合了总土壤呼吸、从土壤表面到地下水位的深度、北卡罗来纳州东部三个地点和弗吉尼亚州东南部一个地点的排水和恢复泥炭地的土壤温度和土壤温度,以调查总土壤呼吸与物理驱动因素之间的关系,并开发将总土壤呼吸与参数相关联的模型,这些参数可以在场。在排水和水文恢复的泥炭地中,总土壤呼吸随着地下水位的加深和土壤温度的升高而增加。与恢复地点(R2 = 0.28,p < 0.0001)相比,土壤呼吸的变化与排水区域(R2 = 0.57,p < 0.0001)的土壤温度的相关性更强。结果表明,排水放大了变暖温度对泥炭分解的影响。与考虑恢复排水泥炭地的潜在气候影响的土地管理者的直接土壤通量测量相比,用于估算泥炭分解产生的 CO2 排放量的代理测量代表了相当大的成本降低。除了地下水位深度和土壤温度等物理变量外,研究还有助于加深对影响土壤呼吸变化的因素的理解。
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